Basic map editor!

sheet.ts

@@ -8,6 +8,9 @@ export type Sheet = {
 } | {
 	sheet_type: "spritesheet",
 	value: Array<Array<number>>,
+} | {
+	sheet_type: "map",
+	value: Array<[number, number]>,
 } | {
 	sheet_type: "none",
 	value: null,
@@ -34,7 +37,15 @@ export const getCodeSheet = (sheet: number) => {
 export const getSpriteSheet = (sheet: number) => {
 	const {sheet_type, value} = getSheet(sheet);
 	if (sheet_type !== "spritesheet") {
-		throw "Trying to use a non-sprite sheet as a spritesheet."
+		throw Error("Trying to use a non-sprite sheet as a spritesheet.");
+	}
+	return value;
+}
+
+export const getMapSheet = (sheet: number) => {
+	const {sheet_type, value} = getSheet(sheet);
+	if (sheet_type !== "map") {
+		throw "Trying to use a non-map sheet as a map."
 	}
 	return value;
 }